JP6107758B2 - Roller type transfer device - Google Patents

Description

    The present invention relates to a roller-type conveyance device including a roller that conveys an object to be conveyed.

  As a conventional technique, for example, as described in Patent Document 1, a roller-type conveyance device that conveys an object to be conveyed by rotating a conveyance roller is known. In the related art, the transported object is transported by utilizing the frictional force between the transport roller and the transported object by rotating the transport roller in contact with the transported object. Such a transport device is mounted on, for example, a printer having a function of transporting photographic paper, film, or the like. In the prior art, in order to ensure the frictional force with the object to be conveyed, protrusions are provided in a fixed arrangement pattern on the surface of the conveying roller.

Japanese Patent No. 3271848

  In the prior art described above, protrusions are provided in a fixed arrangement pattern on the surface of the transport roller. However, in such a configuration, when the transport roller rotates, the relative position of the protrusion with respect to the transported object periodically changes according to the periodicity of the array pattern, and accordingly, the transport roller and the transported object The frictional force may fluctuate periodically. For this reason, in the prior art, even if the transport roller is rotated in a constant state, a phenomenon (uneven transport amount) in which the transport amount of the transported object periodically varies due to the fluctuation of the frictional force occurs. There is a problem that a defect occurs. For example, in a printer or the like that prints an image on an object to be transported, if unevenness in the transport amount occurs, periodic shading due to the spacing between the protrusions (inter-protrusion pitch) occurs in the image, and the image quality is low. descend.

  The present invention has been made to solve the above-described problems, and can suppress periodic conveyance unevenness due to the pitch between protrusions of the conveyance roller and improve image density unevenness in a printing apparatus or the like. It is an object of the present invention to provide a roller type transport device that can be used.

The roller-type transport device according to the present invention is formed in a cylindrical shape having an axis, and is provided on the outer peripheral surface of the roller body that rotates around the axis when transporting the transported object. A plurality of protrusions arranged in a plurality of protrusion formation areas set by dividing the outer peripheral surface of the roller body in the axial direction, and in each protrusion formation area The plurality of protrusions are distributed in the circumferential direction of the roller body , and each protrusion is composed of a plurality of protrusions arranged in a line along the axial direction of the roller body. The circumferential arrangement pattern of the protrusions arranged in at least one of the formation areas is shifted in the circumferential direction with respect to the arrangement pattern of the projections arranged in any other projection formation area. As composition There.
The roller type conveying device according to the present invention is formed in a cylindrical shape having an axis, and is provided on a roller main body that rotates around the axis when conveying an object to be conveyed, and an outer peripheral surface of the roller main body. And a plurality of protrusions arranged in a plurality of protrusion formation areas set by dividing the outer peripheral surface of the roller body in the axial direction, and forming individual protrusions. In the region, the plurality of protrusions are distributed in the circumferential direction of the roller body, and the circumferential arrangement pattern of each protrusion disposed in at least one of the plurality of protrusion formation regions is: It is shifted in the circumferential direction with respect to the array pattern of the respective protrusions arranged in any other protrusion forming area, and the array pattern of the other protrusion forming area is shifted in the circumferential direction with reference to the array pattern of one protrusion forming area. Offset is the amount has a configuration obtained by set differently for each projection forming region.
The roller type conveying device according to the present invention is formed in a cylindrical shape having an axis, and is provided on a roller main body that rotates around the axis when conveying an object to be conveyed, and an outer peripheral surface of the roller main body. And a plurality of protrusions arranged in a plurality of protrusion formation regions set by dividing the outer peripheral surface of the roller body in the axial direction, and the individual protrusions. In the formation region, the plurality of projections are arranged at regular intervals in the circumferential direction of the roller body, and the circumferential direction of each projection arranged in at least one projection formation region among the plurality of projection formation regions The arrangement pattern of is shifted in the circumferential direction with respect to the arrangement pattern of each protrusion arranged in any other protrusion formation area, and the arrangement pattern of the other protrusion formation area is based on the arrangement pattern of one protrusion formation area. The offset amount X, which is the amount by which the protrusion is shifted in the circumferential direction, is set to be different for each protrusion formation region by a unit offset amount Zn. Based on the inter-protrusion pitch d in the direction, the structure is set by the formula Zn = d / n.

  According to the present invention, it is possible to cancel the fluctuation of the frictional force caused by the pitch between the protrusions in the individual protrusion forming areas between the plurality of protrusion forming areas. Further, the frequency at which the frictional force fluctuates can be increased, and the position fluctuation frequency of the conveyed object can also be increased. Therefore, it is possible to suppress periodic conveyance unevenness due to the pitch between the protrusions of the conveyance roller, and to improve the performance of the roller type conveyance device. In particular, in a printing apparatus such as a printer, it is possible to improve the image quality by making the density unevenness of the image less noticeable.

It is a perspective view which shows the roller-type conveying apparatus by Embodiment 1 of this invention. FIG. 5 is a development view showing an outer peripheral surface of a roller body in a case where n projection forming areas are set. FIG. 6 is a development view showing the outer peripheral surface of the roller body in a developed state when two projection forming areas are set. It is a characteristic diagram which shows the frequency characteristic of the speed fluctuation amplitude of a to-be-conveyed object, when two protrusion formation areas are set. It is a characteristic diagram which shows the frequency characteristic of the position fluctuation | variation amplitude of a to-be-conveyed object, when two protrusion formation areas are set. It is a characteristic diagram which shows the frequency characteristic of the speed fluctuation amplitude of a to-be-conveyed object, when three protrusion formation area | regions are set. It is a characteristic diagram which shows the frequency characteristic of the position fluctuation | variation amplitude of a to-be-conveyed object, when three protrusion formation areas are set.

Embodiment 1 FIG.
Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS. In the present embodiment, the case where the roller type conveying apparatus is applied to a printing apparatus such as a printer is illustrated. In the present embodiment, the specific values such as the number, quantity, range and the like of each element described or illustrated do not limit the present invention unless otherwise specified.

  FIG. 1 is a perspective view showing a roller type conveying apparatus according to Embodiment 1 of the present invention. As shown in this figure, the roller-type transport device includes a pair of transport rollers 1, a support unit 2, a drive unit 3, and the like. Each transport roller 1 is formed in a cylindrical shape having an axis, and is rotatably supported by the support unit 2 in a state where the axes are arranged in parallel to each other. The driving unit 3 drives the respective transport rollers 1 to rotate in opposite directions. At the time of operation of the roller type conveying device, the driving unit 3 operates to rotate each conveying roller 1 around the axis. Thereby, each conveyance roller 1 uses the frictional force which arises when the projection part 11 mentioned later and a to-be-conveyed object contact, pinching to-be-conveyed objects, such as paper, and rotates a to-be-conveyed object to a rotation direction Transport.

  Next, the configuration of the transport roller 1 will be described. The transport roller 1 includes a cylindrical roller body 10 and a plurality of protrusions 11 provided on the outer peripheral surface of the roller body 10. FIG. 2 is a developed view showing the outer peripheral surface of the roller body 10. The vertical direction and the horizontal direction in this figure correspond to the circumferential direction and the axial direction of the roller body 10, respectively. In this specification, “circumferential direction” and “axial direction” mean the circumferential direction and axial direction of the transport roller 1 (roller body 10) unless otherwise specified.

  As shown in FIG. 2, each protrusion 11 is composed of a plurality of protrusions 11A and 11B. FIG. 2 illustrates a case where one protrusion 11 is constituted by five protrusions 11A and 11B (specifically, three protrusions 11A and two protrusions 11B). Each protrusion 11A, 11B is formed of a resin material such as rubber, for example, and protrudes from the outer peripheral surface of the roller body 10 with a preset protrusion dimension. Further, the protrusion 11A has, for example, a triangular outline with one apex facing in the circumferential direction. On the other hand, the protrusion 11B has the same outline as the protrusion 11A, but the apex is arranged in the direction opposite to the protrusion 11A in the circumferential direction. The protrusions 11A and 11B constituting one protrusion 11 are arranged at equal intervals along the axial direction, and the protrusions 11A and the protrusions 11B are arranged alternately in the axial direction.

  Further, as shown in FIGS. 1 and 2, a plurality of projection forming areas A serving as a reference when the protruding portions 11 are arranged in the axial direction are set on the outer peripheral surface of the roller body 10. Each projection forming area A is set by dividing the outer peripheral surface of the roller body 10 into a plurality of areas in the axial direction, and is arranged at different positions in the axial direction. FIG. 1 illustrates the case where the three protrusion forming areas A are set with an interval in the axial direction. FIG. 2 illustrates the case where n projection forming areas A (A1, A2, A3,..., An) are set. In the present invention, the number n of the protrusion forming regions A may be set to an arbitrary integer of 2 or more.

  A plurality of protrusions 11 are arranged in each protrusion formation region A. Further, in each protrusion formation region A, a plurality of protrusions 11 are arranged in a distributed manner in the circumferential direction. More specifically, the same number of projections 11 are arranged in each projection formation region A, and are arranged at regular intervals in the circumferential direction in each projection formation region A. In the present embodiment, as shown in FIG. 2, for example, the circumferential length d that is the circumferential dimension of the protrusions 11 and the interprotrusion pitch that is the circumferential distance between the protrusions 11. d may be set to an equal value. Further, the total protrusion area obtained by summing the areas of the protrusions 11 arranged in one protrusion forming area A is set to be equal between the protrusion forming areas A.

  Further, the circumferential arrangement pattern of the protrusions 11 arranged in the individual protrusion formation areas A is shifted in the circumferential direction with respect to the arrangement pattern of the protrusions 11 arranged in the other protrusion formation areas A. Yes. As a specific example, in FIG. 2, for example, each of the protrusion formation regions A1 to An has an array pattern in which the same number of protrusions 11 are arranged at equal intervals in the circumferential direction. However, the arrangement pattern of each of the projection formation areas A1 to An is set so as to be shifted in the circumferential direction so that the circumferential positions of the projections 11 are different among all the projection formation areas.

  In other words, the offset amount X of each protrusion forming area A is set to have a different value for each protrusion forming area A. The offset amount X is an amount of movement (a dimension in the circumferential direction) that shifts the arrangement pattern of the other projection forming area A in the circumferential direction with reference to the arrangement pattern of one projection forming area A (for example, the projection forming area A1). ). In this specification, “the arrangement pattern in the circumferential direction of the protrusions 11 arranged in the protrusion formation area A” may be abbreviated as “the arrangement pattern of the protrusion formation area A”. In addition, the “offset amount X of the array pattern of the protrusion formation region A” may be abbreviated as “the offset amount X of the protrusion formation region A”.

  In addition, in the case where numbers are assigned in order from the region where the offset amount X is small with respect to all the protrusion formation regions A, the offset amount X of each protrusion formation region A increases by the unit offset amount Zn every time the number increases. Is set to The unit offset amount Zn is set by the following equation (1) based on the number n of the protrusion forming areas A and the pitch d between the protrusions in each protrusion forming area A. That is, if the number of an arbitrary protrusion formation region A numbered as described above is m and the offset amount of the protrusion formation region A is Xm, the offset amount Xm of the mth protrusion formation region A is a unit offset amount. Based on Zn, it is set by the following formula (2).

Zn = d / n (1)
Xm = Zn * (m−1) (2)

  In the above equation (2), the number m is an integer in the range of 1 to n, and the protrusion formation region where m = 1 corresponds to the reference protrusion formation region. FIG. 2 illustrates a configuration in which the protrusion formation area A1 is used as a reference protrusion formation area, and the offset amount X of the protrusion formation area An is increased by a unit offset amount Zn with respect to the reference protrusion formation area. In this drawing, illustration of other projection forming regions located between the projection forming regions A1 and An is omitted.

  Next, referring to FIG. 3, a specific example in the case where there are two protrusion formation regions A (n = 2) will be described. FIG. 3 is a development view in which the outer peripheral surface of the roller body is developed in the case where two projection forming areas are set. In this case, according to the expressions (1) and (2), the unit offset amount Z2 = d / 2, and the offset amount X2 of the second protrusion formation region A is equal to the unit offset amount Z2. Therefore, as shown in FIG. 3, for example, the edge on one side in the circumferential direction (the lower side in the drawing) of each projection 11 in the projection formation area A2 is the intermediate position of the gap between each projection 11 in the projection formation area A1. It will be in the state arranged in.

  As described above, according to the above configuration, in the projection view in which all the protrusions 11 are viewed from the axial direction of the transport roller 1, there are other protrusions 11 between any two protrusions 11 separated by the pitch d between the protrusions. The edges of (n−1) projections 11 belonging to the projection formation area A are evenly arranged in a state of being separated by a unit offset amount Zn.

  Next, with reference to FIGS. 4 to 7, the operation and effect of the roller type conveying apparatus according to the present embodiment will be described. FIG. 4 is a characteristic diagram showing the frequency characteristics of the speed fluctuation amplitude of the conveyed object. FIG. 5 is a characteristic diagram showing the frequency characteristics of the position variation amplitude of the conveyed object. These drawings illustrate the case where two protrusion formation areas A1 and A2 are set on the transport roller 1 (n = 2). 6 and 7 show characteristic lines similar to those in FIGS. 4 and 5 when there are three protrusion formation regions. Note that the dotted lines shown in FIGS. 4 to 7 indicate the characteristics obtained by the conventional roller type conveying device. The conventional technique does not include a plurality of protrusion forming regions.

  When the transport roller 1 rotates, a plurality of protrusions 11 that are spaced apart in the circumferential direction sequentially come into contact with the object to be transported in each protrusion forming area A. That is, paying attention to one protrusion forming area A, after a certain protrusion 11 is separated from the object to be transported, when the transport roller 1 rotates by the inter-protrusion pitch d, the next protrusion 11 contacts the object to be transported. Since a large frictional force acts on the object to be transported when contacting the protrusion 11, the frictional force varies depending on the presence or absence of the contact. As a result, in the prior art, as shown in FIGS. 4 and 5, the speed and position of the conveyed object fluctuate at a frequency corresponding to the pitch d between protrusions. This fluctuation causes density unevenness in the image and causes a reduction in image quality.

  On the other hand, in the present embodiment, the arrangement patterns of the protrusion formation areas A are shifted in the circumferential direction. As a result, the fluctuation of the frictional force caused by the pitch between the protrusions in each protrusion forming area A can be canceled between the plurality of protrusion forming areas A. Further, the frequency at which the frictional force fluctuates can be increased, and the position fluctuation frequency of the conveyed object can also be increased. As a result, the variation in density unevenness that occurs in the image can be made a high-frequency variation that is not visually noticeable. Further, since there is a relationship x = v / (2πf) among the position x, the speed v, and the frequency f of the conveyed object, the amplitude when the position of the conveyed object fluctuates is reduced, and the density unevenness is reduced. Can be reduced.

  As a specific example, when two projection forming areas A are provided, as shown in FIGS. 4 and 5, the fluctuation frequency of the position of the conveyed object is doubled and the fluctuation amplitude is reduced to 1 /. Can be reduced to two. Further, when the three protrusion forming areas A are provided, as shown in FIGS. 6 and 7, the fluctuation frequency of the position of the conveyed object is increased three times, and the fluctuation amplitude is reduced to 1/3. be able to. More specifically, by providing n projection forming areas A, the position fluctuation frequency can be increased by a factor of n, and the fluctuation amplitude can be reduced to 1 / n. For this reason, as n is increased, a higher effect can be obtained.

  Therefore, according to the present embodiment, it is possible to suppress periodic conveyance unevenness due to the pitch between the protrusions of the conveyance roller 1 and to improve the performance of the roller type conveyance device. In particular, in a printing apparatus such as a printer, it is possible to improve the image quality by making the density unevenness of the image less noticeable. Moreover, according to this Embodiment, the following subjects can be solved. In general, it is preferable to reduce the pitch between protrusions in order to suppress the unevenness of conveyance, but in order to reduce the pitch between protrusions, it is necessary to lower the protrusions due to processing restrictions and the like. On the other hand, considering the functionality of the protrusion, the protrusion needs to have a certain height.

  On the other hand, in the present embodiment, it is possible to realize the interprotrusion pitch d sufficient to ensure the height of the protrusion 11 in each protrusion formation region A. In this state, the overall inter-projection pitch obtained by synthesizing the inter-projection pitch d of each projection forming area A can be reduced to a dimension corresponding to the unit offset amount Zn.

  In the present embodiment, each protrusion 11 is constituted by a plurality of protrusions 11 </ b> A and 11 </ b> B arranged in a line along the axial direction of the roller body 10. Thereby, the protrusion part 11 can be disperse | distributed to the wide range in an axial direction. Accordingly, the strength of the frictional force can be appropriately adjusted while dispersing the frictional force applied to the conveyed object from one protrusion 11 over a wide range, and the conveyed object can be stably stabilized by the conveying roller 1. Can be drawn into.

  The individual protrusions 11 are configured by alternately arranging triangular protrusions 11A and inverted triangular protrusions 11B in the axial direction. Thereby, when the conveyance roller 1 is rotated in the forward direction by a normal conveyance operation, the contact area of the protrusion 11 with respect to the object to be conveyed can be gradually increased from the apex portion of the protrusion 11A. Further, for example, when the transport roller 1 is reversely rotated due to a paper jam or the like, the contact area between the two can be gradually increased from the apex portion of the protrusion 11B. Therefore, regardless of the direction of rotation, the frictional force of the protrusion 11 against the object to be conveyed can be gradually increased, and the object to be conveyed can be pulled in stably.

  In the present embodiment, the same number of protrusions 11 are arranged in each protrusion forming area A, and are arranged at regular intervals in the circumferential direction in each protrusion forming area A. Thereby, at the time of rotation of the conveyance roller 1, an equal friction force can be stably applied to the object to be conveyed in the axial direction and the circumferential direction (rotation direction). In particular, by making the total protrusion area equal between all the protrusion formation regions A, the above-described effects can be exhibited remarkably.

  Moreover, since the offset amount X of the array pattern of each projection forming area A is set to be different for each projection forming area A, the circumferential position of the projection 11 can be made different among all the projection forming areas A. it can. Thereby, the fluctuation | variation of the frictional force resulting from the pitch between protrusions of each protrusion formation area A can be efficiently distributed in the circumferential direction. In particular, in the present embodiment, the offset amount X of each protrusion formation region A is set to be different by the unit offset amount Zn. Thereby, the arrangement pattern of each protrusion formation area A can be equally shifted by the unit offset amount Zn, and the circumferential position of each protrusion 11 seen from the axial direction can be equalized. Accordingly, it is possible to most effectively reduce the fluctuation of the frictional force caused by the pitch between the protrusions in each protrusion forming area A.

  In the first embodiment, the arrangement pattern of each projection forming area A is set on one side and the other side in the axial direction with reference to the axial intermediate position of the entire projection forming area consisting of all the projection forming areas A. You may comprise so that it may become symmetrical. Thereby, the frictional force can be evenly applied to the object to be conveyed on both sides of the conveying roller 1 in the axial direction, and the conveying operation can be performed more stably.

  In the first embodiment, the arrangement pattern of all the protrusion formation regions A is different from each other. However, in the present invention, it is not always necessary to change the arrangement pattern of all the protrusion formation regions A, and the arrangement pattern of at least two protrusion formation regions A may be shifted in the circumferential direction. In the first embodiment, three projections 11 are arranged in each projection formation region A. However, the present invention is not limited to this, and one projection formation region A includes two projections 11 or 4. More than one protrusion 11 may be arranged. Further, the number of the protrusions 11 arranged in one protrusion forming area A may be different between the protrusion forming areas A.

  In the present invention, the shape of the protrusions 11A and 11B is not limited to a triangular shape, and may be set to any other shape such as a quadrangle. Moreover, the one protrusion part 11 may be comprised by multiple-shaped protrusion, and may be comprised by the protrusion of the same shape altogether. The protrusions 11A and 11B may be arranged obliquely with respect to the axial direction. Furthermore, you may comprise the one projection part 11 by a single protrusion.

  In the first embodiment, the case where the present invention is applied to a printing apparatus such as a printer is illustrated. However, the present invention is not limited to this, and can be applied to various types of roller-type conveyance devices other than a printer, as long as the conveyance rollers are rotated to convey an object to be conveyed.

DESCRIPTION OF SYMBOLS 1 Conveyance roller, 2 Support part, 3 Drive part, 10 Roller body, 11 Protrusion part, 11A, 11B Protrusion, A, A1, A2, An Protrusion formation area, X, X2, Xm Offset amount, Zn, Z2 Unit offset amount

Claims (6)

A roller body that is formed in a cylindrical shape having an axis and rotates around the axis when transporting an object to be transported;
Provided on the outer peripheral surface of the roller main body, and provided with a projecting portion that comes into contact with the conveyed object,
A plurality of the protrusions are arranged in a plurality of protrusion formation regions set by dividing the outer peripheral surface of the roller body in the axial direction, and the plurality of protrusions in each protrusion formation region Distributed in the circumferential direction of the roller body ,
Each of the protrusions is composed of a plurality of protrusions arranged in a line along the axial direction of the roller body,
The array pattern in the circumferential direction of each protrusion disposed in at least one protrusion formation area of the plurality of protrusion formation areas is the array pattern of each protrusion disposed in any other protrusion formation area. A roller-type conveying device that is configured to be shifted in the circumferential direction. A roller body that is formed in a cylindrical shape having an axis and rotates around the axis when transporting an object to be transported;
Provided on the outer peripheral surface of the roller main body, and provided with a projecting portion that comes into contact with the conveyed object,
A plurality of the protrusions are arranged in a plurality of protrusion formation regions set by dividing the outer peripheral surface of the roller body in the axial direction, and the plurality of protrusions in each protrusion formation region Distributed in the circumferential direction of the roller body,
The array pattern in the circumferential direction of each protrusion disposed in at least one protrusion formation area of the plurality of protrusion formation areas is the array pattern of each protrusion disposed in any other protrusion formation area. In contrast to the circumferential direction,
One offset is the amount to shift the arrangement pattern in the circumferential direction of the other projection formation region arrangement pattern as a basis for the projection forming region, the projection forming region Ru roller transport device name set differently for each.   3. The roller-type conveying device according to claim 1, wherein the protrusions are arranged in the same number in the plurality of protrusion forming areas, and are arranged at regular intervals in the circumferential direction in the individual protrusion forming areas. . A roller body that is formed in a cylindrical shape having an axis and rotates around the axis when transporting an object to be transported;
Provided on the outer peripheral surface of the roller main body, and provided with a projecting portion that comes into contact with the conveyed object,
The protrusions are arranged in a plurality of the same in a plurality of protrusion formation regions set by dividing the outer peripheral surface of the roller body in the axial direction, and in each protrusion formation region, the plurality of protrusions The parts are distributed at regular intervals in the circumferential direction of the roller body,
The array pattern in the circumferential direction of each protrusion disposed in at least one protrusion formation area of the plurality of protrusion formation areas is the array pattern of each protrusion disposed in any other protrusion formation area. In contrast to the circumferential direction,
The offset amount X, which is the amount by which the array pattern of the other protrusion forming regions is shifted in the circumferential direction with reference to the array pattern of one protrusion forming region, is set to be different by the unit offset amount Zn for each of the protrusion forming regions,
The unit offset Zn, said the number n of the projection forming region, on the basis of the pitch between the circumferential direction of the projections in the individual projections forming region d, Zn = d / n wherein set to Na Ru roller carried by the apparatus. The total projection area area is the sum of the one projection forming region located the said respective protrusions any one of claims 1 to 4 formed by setting to be equal to each other between the respective protrusions forming region The roller type conveying apparatus as described in 2. The arrangement pattern of each of the projection forming areas is configured to be symmetrical between one side and the other side in the axial direction with reference to the axial intermediate position of the entire projection forming area composed of all the projection forming areas. The roller type conveying apparatus according to any one of claims 1 to 5 .

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